The invention provides a pavement water seepage test sealing material laying device. The problems that in the sealing layer laying process before a water seepage test, efficiency is low, the sealing effect is poor, the track of a sealing layer is not a perfect circle, the water seepage area cannot be guaranteed, and time and labor are wasted are effectively solved. According to the technical scheme, the device comprises a base, an inner shell is arranged at the upper end of the base, a cylinder is arranged on the upper side of the inner shell, a vertical rod is arranged in the cylinder, a spiral groove is formed in the vertical rod, and a rotating cylinder is arranged on the outer side of the vertical rod in a sleeving mode; an annular plate is arranged on the outer edge of the inner shell, a plurality of containers penetrate through the annular plate, a plurality of discharging openings are formed in the lower side walls of the containers, square plates are arranged in the containers, the outer side of a cylinder is sleeved with a circular plate, a plurality of threaded pipes penetrate through the circular plate, and threaded rods are arranged in the threaded pipes; an outer cylinder is arranged outside the annular plate, an upper gear ring is arranged on the inner side wall of the outer cylinder, and a disc-shaped gear is fixed on the outer side of each container; a plurality of pressing sheets are arranged below the annular plate, a lower gear ring is fixed on the inner side of the outer cylinder, a plurality of rotating shafts are arranged on the upper side of the annular plate, and bevel gears are arranged on the rotating shafts.